Tubastatin-A protects Caco-2 cells against anoxia (12 hours) injury. Anoxia condition caused significant increased leakage of LDH (*control vs. sham, P<0.0001, 4A), while incubation with Tubastatin-A significantly attenuated the increase (*Tub-A vs. control, P<0.0001, 4A). MTT assay showed that anoxia had a significant decrease of cellular viability compare to sham cells (*control vs. sham, P<0.0001, 3B), while Tubastatin-A treatment significantly restored cellular viability (*Tub-A vs. control, P<0.0001, Figure 4B, 4C). Tub-A: Tubastatin-A treatment; Sham: no anoxia and no treatment; Control: anoxia without treatment; N.C.: negative control.